CoorRe

    require!(remaining >= rent_minimum, CoorreError::InsufficientEscrow);    let credited = to        .lamports()        .checked_add(amount)        .ok_or(CoorreError::Overflow)?;    **from.try_borrow_mut_lamports()? = remaining;    **to.try_borrow_mut_lamports()? = credited;    Ok(())} #[derive(Accounts)]#[instruction(case_id: [u8; 32])]pub struct OpenCase<'info> {    #[account(        init,        payer = creator,        space = 8 + CaseRecord::INIT_SPACE,        seeds = [b"case", creator.key().as_ref(), case_id.as_ref()],        bump    )]    pub case_record: Account<'info, CaseRecord>,    #[account(mut)]    pub creator: Signer<'info>,    pub system_program: Program<'info, System>,

1. Line 217 require!(remaining >= rent_minimum, CoorreError::InsufficientEscrow);: An explicit validation that aborts the instruction with an error.
2. Line 220 .checked_add(amount): Uses checked arithmetic so overflow fails instead of wrapping.
3. Line 231 init,: Creates and pays for a new account. Space and payer must be specified.
4. Line 234 seeds = [b"case", creator.key().as_ref(), case_id.as_ref()],: Declares the PDA seeds. Anchor re-derives the address and rejects the account if it doesn't match.
5. Line 235 bump: Uses the bump seed, the extra byte that pushes the derived address off the ed25519 curve.
6. Line 239 pub creator: Signer<'info>,: Requires this account to have signed the transaction.

    from: &Signer<'info>,    to: &AccountInfo<'info>,    system_program: &Program<'info, System>,    amount: u64,) -> Result<()> {    system_program::transfer(        CpiContext::new(            system_program.to_account_info(),            system_program::Transfer {                from: from.to_account_info(),                to: to.clone(),            },        ),        amount,    )} #[derive(Accounts)]pub struct OpenVault<'info> {    #[account(        init,        payer = authority,        space = 8 + Vault::INIT_SPACE,        seeds = [b"vault", authority.key().as_ref()],

1. Line 85 from: &Signer<'info>,: Requires this account to have signed the transaction.
2. Line 91 CpiContext::new(: Makes a cross-program invocation into another program.
3. Line 105 init,: Creates and pays for a new account. Space and payer must be specified.
4. Line 108 seeds = [b"vault", authority.key().as_ref()],: Declares the PDA seeds. Anchor re-derives the address and rejects the account if it doesn't match.